Mimikyu legality question

[Tian]

this Mimikyu is level 1 with play rough, pkhex shows it is legal. But I check the Bulbapedia, play rough can be learned at level 46, and it is not a egg move and TM.

[Kaphotics]

A [...] move relearner [...] can teach a Pokémon any move that its species is able to learn at an earlier level (Generations II to VI) or at any level (Generation VII) [...].

http://bulbapedia.bulbagarden.net/wiki/Move_Reminder